Submission #1123087

#	Time	Username	Problem	Language	Result	Execution time	Memory
1123087		SalihSahin	Game (IOI14_game)	C++20	0 / 100	0 ms	328 KiB

game

#include <bits/stdc++.h>
#define pb push_back
//#define int long long
using namespace std;
#include "game.h"


int N;
vector<int> par;

struct DSU{
    vector<int> arr;
    int option;
};

vector<DSU> dsuarr;
vector<vector<int> > edge;

int fnd(int a){
    if(a == par[a]) return a;
    else return par[a] = fnd(par[a]);
}

void merge(int a, int b){
    a = fnd(a), b = fnd(b);
    if(a == b) return;

    int new_op = dsuarr[a].option + dsuarr[b].option;
    for(auto itr: dsuarr[a].arr){
        for(auto itr2: dsuarr[b].arr){
            if(edge[itr][itr2] == 0){
                 new_op -= 2;
                 edge[itr][itr2] = edge[itr2][itr] = -1;
            }
        }
    }

    par[b] = a;
    for(auto itr: dsuarr[b].arr){
        dsuarr[a].arr.pb(itr);
    }
    dsuarr[a].option = new_op;
}

void initialize(int n) {
    N = n;
    edge.resize(n);
    for(int i = 0; i < n; i++){
        edge[i].resize(n);
        edge[i][i] = -1;
    }
    dsuarr.resize(n);
    for(int i = 0; i < n; i++){
        dsuarr[i].arr.pb(i);
        dsuarr[i].option = n-1;
    }
    par.resize(n);
    for(int i = 0; i < n; i++){
        par[i] = i;
    }
}


int hasEdge(int u, int v) {
    int uset = fnd(u), vset = fnd(v);
    if(uset == vset) return 0;

    if(dsuarr[uset].option == 1 || dsuarr[vset].option == 1){
        merge(uset, vset);
        edge[uset][vset] = edge[vset][uset] = 1;
        return 1;
    }

    dsuarr[uset].option--;
    dsuarr[vset].option--;
    edge[uset][vset] = edge[vset][uset] = -1;
    return 0;
}

• Subtask 1: 0 / 15
• Subtask 2: 0 / 27
• Subtask 3: 0 / 58